There is no single age at which girls get confirmed. The age for Confirmation varies depending on the denomination and individual church practices.
In some denominations, such as the Catholic Church, Confirmation is typically received in adolescence, often around the age of 14 or 15. However, Confirmation can be received at any age, as long as the individual is prepared and ready to make a public profession of faith.
In other denominations, like the Church of England, the age for Confirmation is less fixed and can be received by adults as well as young people. The age is often determined by the individual's readiness and understanding of the commitment involved.
Ultimately, the age at which a girl gets confirmed is determined by the individual church and the individual's readiness to commit to their faith.